Finding the Fourth Proportional to 9,111.68, 12,580.86 and 5,579.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,111.68 : 12,580.86 = 5,579.72 : x
2. Step 2: Convert to fraction form
   9,111.68/12,580.86 = 5,579.72/x
3. Step 3: Cross multiply
   9,111.68x = 12,580.86 × 5,579.72
4. Step 4: Simplify right side
   9,111.68x = 70,197,676.16
5. Step 5: Solve for x
   x = 70,197,676.16/9,111.68
6. Step 6: Final answer
   x = 7,704.14